JP4151593B2 - Double reflector antenna device - Google Patents

Double reflector antenna device Download PDF

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JP4151593B2
JP4151593B2 JP2004067166A JP2004067166A JP4151593B2 JP 4151593 B2 JP4151593 B2 JP 4151593B2 JP 2004067166 A JP2004067166 A JP 2004067166A JP 2004067166 A JP2004067166 A JP 2004067166A JP 4151593 B2 JP4151593 B2 JP 4151593B2
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mirror
primary radiator
shape
elliptical
matching plate
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JP2005260437A (en
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出 内藤
健児 草壁
聡介 堀江
修次 縫村
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Mitsubishi Electric Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
    • H01Q19/18—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces
    • H01Q19/19—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface

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Description

この発明は、主反射鏡、副鏡、一次放射器とからなる複反射鏡アンテナ装置に関するものである。   The present invention relates to a double-reflecting mirror antenna device including a main reflecting mirror, a sub mirror, and a primary radiator.

特開２００２−１３５０４２号公報には、アンテナ装置において、副鏡の中心近傍におけるＶＳＷＲが劣化することを改善する技術が開示されている。この特開２００２−１３５０４２号公報によれば、従来のアンテナ装置は、放物面形状の主反射鏡と双曲面形状の副鏡との２枚の反射鏡と、一次放射器と、副鏡の中心近傍に設けた凸状又は凹状の円形の頂点整合部とから構成される。一次放射器から放射された電波は、副鏡、主反射鏡で反射されて、空間に放射される。このとき、頂点整合部を設けない場合、一次放射器から副鏡の中心近傍に放射される電波は、そのまま一次放射器に反射され、この反射波によって一次放射器のＶＳＷＲが劣化する。頂点整合部は、副鏡の中心近傍に設けた凸状又は凹状の形状をしており、頂点整合部外部からの一次放射器への再入射波に対して、逆相となるように頂点整合部が設けられる。したがって、一次放射器へ再入射する電波は、頂点整合部を設けることによって全体として概ね打ち消され、ＶＳＷＲの劣化が改善されるものである。   Japanese Patent Application Laid-Open No. 2002-135042 discloses a technique for improving the deterioration of the VSWR in the vicinity of the center of the secondary mirror in the antenna device. According to Japanese Patent Application Laid-Open No. 2002-133502, a conventional antenna device includes two reflectors, a parabolic main reflector and a hyperboloid submirror, a primary radiator, and a submirror. It is composed of a convex or concave circular vertex matching portion provided in the vicinity of the center. The radio wave radiated from the primary radiator is reflected by the secondary mirror and the main reflecting mirror and radiated to the space. At this time, when the apex matching portion is not provided, the radio wave radiated from the primary radiator to the vicinity of the center of the secondary mirror is reflected to the primary radiator as it is, and the VSWR of the primary radiator is deteriorated by the reflected wave. The apex matching part has a convex or concave shape provided near the center of the secondary mirror, and the apex matching so as to be in reverse phase with respect to the re-incident wave from the outside of the apex matching part to the primary radiator Parts are provided. Therefore, the radio wave re-entering the primary radiator is generally canceled out as a whole by providing the apex matching portion, and the deterioration of VSWR is improved.

特開２００２−１３５０４２号公報Japanese Patent Laid-Open No. 2002-135042

最近では、航空機や列車、その他の移動体に搭載されて、通信衛星との間で通信を行うアンテナ装置が開発されており、このようなアンテナ装置においては、通信衛星を見通せる天蓋部分へ搭載される場合が多く、主として空力抵抗の低減のため低プロファイル化（据付時の高さ寸法が低いこと）が要求される。このため、主反射鏡を楕円形状とするアンテナ装置が用いられるようになってきた。特許文献１に記載のアンテナ装置においては、副鏡から一次放射器へ再入射される電波を打ち消すように頂点整合部が設けられるものであるが、この特許文献１に開示された頂点整合部の反射面形状は円形であるために、この頂点整合部を上記のような楕円形状の主反射鏡を有するアンテナ装置において用いた場合、頂点整合部の外側から一次放射器へ入射する再入射波と頂点整合部からの再入射波とを全体として効果的に打ち消すことができず、ＶＳＷＲの劣化を十分に改善することができないという問題点があった。また、軸対象の主反射鏡を有するアンテナ装置の一次放射器として断面長方形の角錐ホーンを用いた場合にも、円形の頂点整合部によれば、頂点整合部の外側から一次放射器へ入射する再入射波と頂点整合部からの再入射波とを全体として効果的に打ち消すことができず、ＶＳＷＲの劣化を十分に改善することができないという問題点があった。   Recently, antenna devices have been developed that are mounted on airplanes, trains, and other mobile objects to communicate with communication satellites. Such antenna devices are mounted on the canopy where the communication satellite can be seen. In many cases, a low profile (low height during installation) is required mainly to reduce aerodynamic resistance. For this reason, an antenna device having an elliptical main reflecting mirror has been used. In the antenna device described in Patent Document 1, a vertex matching unit is provided so as to cancel radio waves re-entering the primary radiator from the secondary mirror, but the vertex matching unit disclosed in Patent Document 1 Since the shape of the reflecting surface is circular, when this apex matching part is used in the antenna device having the elliptical main reflector as described above, the re-incident wave incident on the primary radiator from the outside of the apex matching part There is a problem that the re-incident wave from the apex matching portion cannot be effectively canceled as a whole, and the deterioration of the VSWR cannot be sufficiently improved. In addition, when a pyramid horn with a rectangular cross section is used as a primary radiator of an antenna apparatus having a main reflecting mirror that is an axis target, the circular apex matching unit makes the incident light to the primary radiator from the outside of the apex matching unit. There is a problem that the re-incident wave and the re-incident wave from the apex matching portion cannot be effectively canceled as a whole, and the deterioration of the VSWR cannot be sufficiently improved.

この発明は、上記のような問題を解決するためになされたもので、複反射鏡アンテナ装置において、副鏡部分に適切な形状の頂点整合板を設けて一次放射器への再入射波を打ち消し、ＶＳＷＲの劣化を改善するアンテナ装置を得ることを目的とする。   The present invention has been made to solve the above-described problems. In the double-reflecting mirror antenna apparatus, an apex matching plate having an appropriate shape is provided in the sub-mirror portion to cancel the re-incident wave on the primary radiator. An object of the present invention is to obtain an antenna device that improves the degradation of VSWR.

請求項１の発明に係る複反射鏡アンテナ装置は、楕円形状の主反射鏡と、この主反射鏡に対向して設けた円形状の副鏡と、この副鏡に対向して設けられ、上記副鏡へ電波を放射する円錐形の一次放射器と、上記副鏡の略中央部に設けられ、楕円形状の反射面を有して上記一次放射器から放射された電波を上記一次放射器へ反射する台状の頂点整合板であって、その楕円形状の短軸方向を上記主反射鏡の楕円形状の長軸方向とした頂点整合板とを備えたものである。 The double-reflecting mirror antenna device according to the invention of claim 1 is provided with an elliptical main reflecting mirror, a circular sub-mirror provided opposite to the main reflecting mirror, and opposed to the sub-mirror. A conical primary radiator that radiates radio waves to the secondary mirror, and an electromagnetic wave that is provided at an approximately central portion of the secondary mirror and has an elliptical reflecting surface and is radiated from the primary radiator to the primary radiator. A reflecting plate-like apex matching plate is provided that has an elliptical minor axis direction in the elliptical major axis direction of the main reflecting mirror .

請求項２の発明に係る複反射鏡アンテナ装置は、請求項１の発明に係る複反射鏡アンテナ装置において、上記頂点整合板は、その周囲をスカート状に形成したものである。 A double-reflecting mirror antenna device according to a second aspect of the present invention is the double-reflecting mirror antenna device according to the first aspect of the present invention, wherein the apex matching plate is formed in a skirt shape around the apex matching plate .

請求項１に記載の発明によれば、楕円形状の主反射鏡を有する複反射鏡アンテナ装置において、円形状の副鏡の略中央部に楕円形状の反射面を有する頂点整合板を設けたので、円錐形の一次放射器への再入射によるＶＳＷＲの劣化を抑制することができる。 According to the first aspect of the present invention, in the double-reflecting mirror antenna apparatus having the elliptical main reflecting mirror, the apex matching plate having the elliptical reflecting surface is provided at the substantially central portion of the circular secondary mirror. In addition, it is possible to suppress the deterioration of the VSWR due to re-incident on the conical primary radiator.

請求項２に記載の発明によれば、頂点整合板の周囲をスカート状に形成したので、頂点整合板周囲での電波の散乱を抑え、放射特性の劣化を抑制することができる。 According to the second aspect of the present invention, since the periphery of the apex matching plate is formed in a skirt shape, the scattering of radio waves around the apex matching plate can be suppressed, and deterioration of radiation characteristics can be suppressed.

この発明の実施の形態１に係る複反射鏡アンテナ装置を図１及び図２に基づき説明する。図１はこの発明の実施の形態１に係る複反射鏡アンテナ装置の構成図である。図１において、１は主反射鏡、２は主反射鏡に対向して設けた副鏡、３は副鏡２に対向して設けた一次放射器である。主反射鏡１は楕円形状の外形を有し、その鏡面形状は凹面の非球面形状（例えば放物面又はその修正した鏡面形状等）である。副鏡２は略円形状の外形を有し、その鏡面形状は凸面の非球面形状（例えば双曲面又はその修正した鏡面形状等）である。一次放射器３は円錐形のホーン放射器である。一次放射器３から放射する電波は、副鏡２で反射され、さらに主反射鏡１により反射されて空間に放射する構成となっており、この複反射鏡アンテナ装置はカセグレン式のアンテナ構成となっている。４は副鏡２の略中央部において一次放射器３に対向して設けた楕円形状の頂点整合板であり、一次放射器３に対向して楕円形状の鏡面を有し、一次放射器３から放射した電波を一次放射器３に向けて反射する。５は一次放射器３のホーン開口を含む開口面であり、６は頂点整合板４からの反射波の開口面５における通過領域、７は一次放射器３の位相中心である。   A double reflector antenna apparatus according to Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a configuration diagram of a double reflector antenna apparatus according to Embodiment 1 of the present invention. In FIG. 1, 1 is a main reflector, 2 is a sub-mirror provided opposite to the main reflector, and 3 is a primary radiator provided opposite to the sub-mirror 2. The main reflecting mirror 1 has an elliptical outer shape, and the mirror surface shape is a concave aspherical shape (for example, a paraboloid or a modified mirror surface shape thereof). The secondary mirror 2 has a substantially circular outer shape, and the mirror surface shape is a convex aspherical shape (for example, a hyperboloid or a modified mirror surface shape thereof). The primary radiator 3 is a conical horn radiator. The radio wave radiated from the primary radiator 3 is reflected by the sub-mirror 2 and further reflected by the main reflector 1 to radiate to the space. This double reflector antenna device has a Cassegrain type antenna configuration. ing. Reference numeral 4 denotes an elliptical apex matching plate provided at the substantially central portion of the secondary mirror 2 so as to face the primary radiator 3, and has an elliptical mirror surface facing the primary radiator 3. The radiated radio wave is reflected toward the primary radiator 3. Reference numeral 5 denotes an opening surface including the horn opening of the primary radiator 3, 6 denotes a passing region of the reflected wave from the apex matching plate 4 on the opening surface 5, and 7 denotes a phase center of the primary radiator 3.

次に、図２を用いて実施の形態１に係る複反射鏡の動作について説明する。図２は実施の形態１に係る複反射鏡アンテナ装置の断面図である。図２において、８は主反射鏡１の長軸を含む断面内での副鏡２の焦点、９は主反射鏡１の短軸を含む断面内での副鏡２の焦点である。図２において、図１と同一の符号を付した部品及び部位は、図１におけるそれらの部品及び部位と同一のものである。   Next, the operation of the double reflector according to the first embodiment will be described with reference to FIG. FIG. 2 is a sectional view of the double reflector antenna device according to the first embodiment. In FIG. 2, 8 is the focal point of the secondary mirror 2 in the cross section including the major axis of the main reflecting mirror 1, and 9 is the focal point of the secondary mirror 2 in the cross section including the minor axis of the main reflecting mirror 1. In FIG. 2, the parts and portions denoted by the same reference numerals as those in FIG. 1 are the same as those parts and portions in FIG.

一次放射器３から放射する電波は、幾何光学的に概ね位相中心７を出発点とする光線と同様に振る舞い、副鏡２で反射された後、副鏡２の焦点を出発点とする光線方向に進行する。このとき、副鏡２の端部（反射面の周縁部）に入射した電波は、主反射鏡１の端部（楕円形状反射面の周縁部）に進行するが、主反射鏡１の開口が楕円となるように主反射鏡１及び副鏡２は鏡面修正しており、図２に示すように主反射鏡１の長軸方向断面内での副鏡２の焦点８は、主反射鏡１の短軸方向断面内での副鏡２の焦点９に比べて副鏡２に近い位置に来る。従って、頂点整合板４を楕円形とし、その短軸方向を主反射鏡１の長軸方向に、その長軸方向を主反射鏡１の短軸方向とすることによって、頂点整合板４からの反射波のホーン開口における通過領域６を、一次放射器３の開口に整合する略円形とすることができる。このことは、換言すれば、主反射鏡１の短軸方向断面における副鏡２からの反射波中で一次放射器３開口が占める断面の割合と、長軸方向断面における一次放射器３開口が占める断面の割合とを比べ、その割合が前者において大きいことから、頂点整合板４の形状を楕円形として、その短軸方向を主反射鏡１の長軸方向に、その長軸方向を主反射鏡１の短軸方向にとったものとも考えられる。頂点整合板４は、頂点整合板４で反射されて一次放射器３の開口に再入射する電波が、頂点整合板４の外側で反射されて一次放射器３の開口に再入射する電波を打ち消すように、その長短軸比や板厚などを設定する。このように、頂点整合板４を設定することによって、主反射鏡１の外形を楕円形状とした複反射鏡アンテナ装置において、一次放射器３へ再入射する電波を効果的に打ち消して、一次放射器３におけるＶＳＷＲの劣化を抑制することができる。   The radio wave radiated from the primary radiator 3 behaves geometrically and substantially in the same manner as a light beam starting from the phase center 7, and after being reflected by the secondary mirror 2, the direction of the light beam starting from the focal point of the secondary mirror 2. Proceed to. At this time, the radio wave incident on the end of the secondary mirror 2 (periphery of the reflecting surface) travels to the end of the main reflecting mirror 1 (peripheral of the elliptical reflecting surface). The main reflecting mirror 1 and the secondary mirror 2 are mirror-corrected so as to be elliptical, and the focal point 8 of the secondary mirror 2 in the longitudinal cross section of the primary reflecting mirror 1 is the main reflecting mirror 1 as shown in FIG. Compared with the focal point 9 of the secondary mirror 2 in the cross section in the short axis direction, the position is closer to the secondary mirror 2. Therefore, the apex matching plate 4 is elliptical, the short axis direction is the major axis direction of the main reflector 1, and the major axis direction is the minor axis direction of the main reflector 1. The passing region 6 at the horn opening of the reflected wave can be a substantially circular shape that matches the opening of the primary radiator 3. In other words, the ratio of the cross section occupied by the opening of the primary radiator 3 in the reflected wave from the secondary mirror 2 in the short-axis direction cross section of the main reflecting mirror 1 and the opening of the primary radiator 3 in the long-axis direction cross section Compared with the ratio of the cross section occupied, the ratio is large in the former, so that the shape of the vertex matching plate 4 is an ellipse, the minor axis direction is the major axis direction of the main reflector 1, and the major axis direction is the main reflection. It can be considered that the mirror 1 is taken in the short axis direction. The apex matching plate 4 cancels the radio wave reflected by the apex matching plate 4 and re-entering the opening of the primary radiator 3 and reflected by the outside of the apex matching plate 4 and re-entering the opening of the primary radiator 3. As such, the long / short axis ratio and the plate thickness are set. In this way, by setting the apex matching plate 4, in the double reflector antenna device in which the outer shape of the main reflector 1 is elliptical, the radio wave re-entering the primary radiator 3 is effectively canceled and primary radiation is obtained. Degradation of VSWR in the vessel 3 can be suppressed.

実施の形態２ Embodiment 2

図３は、この発明の実施の形態２に係る複反射鏡アンテナ装置の構成図である。図３において、１０は副鏡であり、副鏡１０は一次放射器３から見て凹形状とし、主反射鏡１、副鏡１０、一次放射器３からなる複反射鏡アンテナ装置は、グレゴリアン形式のアンテナ構成となっている。図３において、図１と同一の符号を付した部品及び部位は、図１におけるそれらの部品及び部位と同一又は相当するものとする。   FIG. 3 is a block diagram of a double reflector antenna device according to Embodiment 2 of the present invention. In FIG. 3, reference numeral 10 denotes a secondary mirror, the secondary mirror 10 has a concave shape when viewed from the primary radiator 3, and the double-reflector antenna apparatus including the primary reflector 1, the secondary mirror 10, and the primary radiator 3 is a Gregorian type. The antenna configuration. In FIG. 3, parts and parts denoted by the same reference numerals as those in FIG. 1 are the same as or correspond to those parts and parts in FIG. 1.

この実施の形態２に係る複反射鏡アンテナ装置においては、副鏡１０の焦点位置は、主反射鏡１と副鏡２との間に配置される。頂点整合板４は実施の形態１と同様に外形を楕円形状として副鏡１０の略中央部に設ける。頂点整合板４の長軸方向を主反射鏡１の短軸方向に、その短軸方向を主反射鏡１の長軸方向にとることにより、グレゴリアン形式の複反射鏡アンテナ装置においても、一次放射器３への再入射波を効果的に打ち消して、一次放射器３におけるＶＳＷＲの劣化を抑制することができる。   In the double-reflecting mirror antenna device according to the second embodiment, the focal position of the secondary mirror 10 is arranged between the main reflecting mirror 1 and the secondary mirror 2. As in the first embodiment, the vertex alignment plate 4 is provided in the substantially central portion of the secondary mirror 10 with an elliptical outer shape. By taking the major axis direction of the apex matching plate 4 as the minor axis direction of the main reflector 1 and taking the minor axis direction as the major axis direction of the main reflector 1, even in the Gregorian-type double reflector antenna device, primary radiation can be obtained. It is possible to effectively cancel the re-incident wave on the radiator 3 and suppress the deterioration of the VSWR in the primary radiator 3.

実施の形態３ Embodiment 3

図４は、この発明の実施の形態３に係る複反射鏡アンテナ装置の頂点整合板の構成図である。図４において、１１は頂点整合板４の周囲において設けたスカート部である。この図４に示す頂点整合板４は、実施の形態１又は実施の形態２において、それぞれ対応する図１又は図２に用いることができる。   FIG. 4 is a configuration diagram of the apex matching plate of the double reflector antenna device according to Embodiment 3 of the present invention. In FIG. 4, reference numeral 11 denotes a skirt portion provided around the apex alignment plate 4. The vertex alignment plate 4 shown in FIG. 4 can be used in FIG. 1 or FIG. 2 corresponding to Embodiment 1 or Embodiment 2, respectively.

図４において、頂点整合板４の周囲をスカート状に形成することによって、副鏡２と頂点整合板４との段差をなくしている。一般に、副鏡２上での段差は散乱の原因となり、特定の方向のサイドローブを上昇させる。この実施の形態４においては、頂点整合板４の周囲にスカート状にすることにより段差をなくし、散乱の原因を除去し、頂点整合板４の装荷による放射特性の劣化を招くことなく、一次放射器３への再入射波を打ち消して、一次放射器３のＶＳＡＲ劣化を抑制することができる。   In FIG. 4, the step between the secondary mirror 2 and the vertex alignment plate 4 is eliminated by forming the periphery of the vertex alignment plate 4 in a skirt shape. In general, a step on the secondary mirror 2 causes scattering and raises a side lobe in a specific direction. In the fourth embodiment, a step is eliminated by forming a skirt around the apex matching plate 4 to eliminate the cause of scattering, and the primary radiation without deteriorating the radiation characteristics due to the loading of the apex matching plate 4. The VSAR deterioration of the primary radiator 3 can be suppressed by canceling the re-incident wave on the radiator 3.

実施の形態４ Embodiment 4

図５は、この発明の実施の形態４に係る複反射鏡アンテナ装置の構成図である。図５において、１２は角錐ホーンを有する一次放射器である。図５において図１と同一の符号を付した部品及び部位は、図１におけるそれらの部品及び部位と同一又は相当するものである。   FIG. 5 is a configuration diagram of a double reflector antenna device according to Embodiment 4 of the present invention. In FIG. 5, 12 is a primary radiator having a pyramid horn. In FIG. 5, parts and parts denoted by the same reference numerals as those in FIG. 1 are the same as or correspond to those parts and parts in FIG. 1.

この実施の形態４においては、頂点整合板４からの反射波のホーン開口における通過領域６を、一次放射器１２の角錐ホーンの長方形の開口形状に整合する楕円形となるように、頂点整合板４の楕円形状の縦横比を設定している。もし仮に頂点整合板４の形状を一次放射器１２の開口形状に合わせて長方形とした場合、波動的効果により頂点整合板４からの反射波のホーン開口での通過領域６は角のとれた形状となり、さらには頂点整合板４の長方形形状の角が散乱の原因となり放射特性の劣化原因となる。このため上記のように頂点整合板４は楕円形状として頂点整合板４からの反射波の通過領域６が、一次放射器１２の長方形のホーン開口に最も整合する楕円形の通過領域６となるように、頂点整合板１２の楕円形の縦横比を設定する。図５においては、頂点整合板４の楕円形状の縦横比を設定することにより、頂点整合板４からの反射波の通過領域６を楕円形としており、一次放射器１２の角錐ホーンの長方形の開口形状に対し、その長方形の長手方向を通過領域６の長軸方向に、その長方形の短手方向を通過領域６の短軸方向としている。なお、一次放射器１２においては、角錐ホーン形状のものに代えて楕円（開口）ホーンを用いても同様の効果が得られる。   In the fourth embodiment, the apex matching plate is formed so that the passing region 6 in the horn opening of the reflected wave from the apex matching plate 4 has an elliptical shape that matches the rectangular opening shape of the pyramid horn of the primary radiator 12. The aspect ratio of the elliptical shape of 4 is set. If the shape of the apex matching plate 4 is a rectangle that matches the opening shape of the primary radiator 12, the passing region 6 at the horn opening of the reflected wave from the apex matching plate 4 has a rounded shape due to the wave effect. Further, the rectangular corners of the apex matching plate 4 cause scattering and cause deterioration of radiation characteristics. For this reason, as described above, the apex matching plate 4 is elliptical so that the reflected wave passing region 6 from the apex matching plate 4 becomes the elliptical passing region 6 that best matches the rectangular horn opening of the primary radiator 12. In addition, the elliptical aspect ratio of the vertex matching plate 12 is set. In FIG. 5, by setting the aspect ratio of the elliptical shape of the vertex matching plate 4, the reflected wave passing region 6 from the vertex matching plate 4 is made elliptical, and the rectangular opening of the pyramid horn of the primary radiator 12. With respect to the shape, the longitudinal direction of the rectangle is the major axis direction of the passage region 6, and the short direction of the rectangle is the minor axis direction of the passage region 6. In the primary radiator 12, the same effect can be obtained by using an elliptical (opening) horn instead of the pyramid horn shape.

実施の形態５ Embodiment 5

図６は、この発明の実施の形態５に係る複反射鏡アンテナ装置の構成図である。図６において、１３は軸対称に形成した主反射鏡であり、主反射鏡１４は略円形状の外形を有し、その鏡面形状は凹面の非球面形状（例えば放物面又はその修正した鏡面形状等）である。１４は軸対称に形成した副鏡であり、副鏡１４は略円形状の外形を有し、その鏡面形状は凸面の非球面形状（例えば双曲面又はその修正した鏡面形状等）である。図６において、図５と同一の符号を付した部品又は部位は図５におけるそれらの部品又は部位と同一又は相当するものである。   FIG. 6 is a configuration diagram of a double-reflecting mirror antenna apparatus according to Embodiment 5 of the present invention. In FIG. 6, 13 is an axially symmetric main reflecting mirror, and the main reflecting mirror 14 has a substantially circular outer shape, and its mirror surface shape is a concave aspherical surface (for example, a parabolic surface or a modified mirror surface thereof). Shape). Reference numeral 14 denotes an auxiliary mirror formed symmetrically about the axis, and the auxiliary mirror 14 has a substantially circular outer shape, and its mirror surface shape is a convex aspherical shape (for example, a hyperboloid or a modified mirror surface shape thereof). In FIG. 6, parts or portions denoted by the same reference numerals as those in FIG. 5 are the same as or correspond to those parts or portions in FIG. 5.

この実施の形態５においては、頂点整合板４からの反射波のホーン開口における通過領域６を、一次放射器１２の角錐ホーンの長方形の開口形状に整合する楕円形となるように、頂点整合板４の楕円形状の縦横比を設定している。主反射鏡１３、副鏡１４が軸対称であっても、一次放射器１２の開口は長方形であって軸対称ではない。このような場合にも、楕円形の頂点整合板４の縦横比を適切に設定することで、効果的に一次放射器１２の角錐ホーンへの再入射波を打ち消すことができ、一次放射器１２のＶＳＷＲの劣化を抑制することができる。なお、一次放射器１２においては、角錐ホーン形状のものに代えて楕円（開口）ホーンを用いても同様の効果が得られる。   In the fifth embodiment, the apex matching plate is formed so that the passing region 6 in the horn opening of the reflected wave from the apex matching plate 4 has an elliptical shape that matches the rectangular opening shape of the pyramid horn of the primary radiator 12. The aspect ratio of the elliptical shape of 4 is set. Even if the main reflector 13 and the sub mirror 14 are axisymmetric, the opening of the primary radiator 12 is rectangular and not axisymmetric. Even in such a case, by appropriately setting the aspect ratio of the elliptical vertex matching plate 4, the re-incident wave on the pyramid horn of the primary radiator 12 can be effectively canceled, and the primary radiator 12. Degradation of VSWR can be suppressed. In the primary radiator 12, the same effect can be obtained by using an elliptical (opening) horn instead of the pyramid horn shape.

この発明の実施の形態１に係る複反射鏡アンテナ装置の構成図である。It is a block diagram of the double reflector antenna device which concerns on Embodiment 1 of this invention. この発明の実施の形態１に係る複反射鏡アンテナ装置の断面図である。It is sectional drawing of the double reflector antenna apparatus which concerns on Embodiment 1 of this invention. この発明の実施の形態２に係る複反射鏡アンテナ装置の構成図である。It is a block diagram of the double reflector antenna apparatus which concerns on Embodiment 2 of this invention. この発明の実施の形態３に係る複反射鏡アンテナ装置の構成図である。It is a block diagram of the double reflector antenna apparatus which concerns on Embodiment 3 of this invention. この発明の実施の形態４に係る複反射鏡アンテナ装置の構成図である。It is a block diagram of the double reflector antenna apparatus which concerns on Embodiment 4 of this invention. この発明の実施の形態５に係る複反射鏡アンテナ装置の構成図である。It is a block diagram of the double reflector antenna apparatus which concerns on Embodiment 5 of this invention.

符号の説明Explanation of symbols

１、１３ 主反射鏡
２、１０、１４ 副鏡
３、１２ 一次放射器
４ 頂点整合板

DESCRIPTION OF SYMBOLS 1,13 Main reflector 2,10,14 Secondary mirror 3,12 Primary radiator 4 Vertex matching plate

Claims (2)

楕円形状の主反射鏡と、この主反射鏡に対向して設けた円形状の副鏡と、この副鏡に対向して設けられ、上記副鏡へ電波を放射する円錐形の一次放射器と、上記副鏡の略中央部に設けられ、楕円形状の反射面を有して上記一次放射器から放射された電波を上記一次放射器へ反射する台状の頂点整合板であって、その楕円形状の短軸方向を上記主反射鏡の楕円形状の長軸方向とした頂点整合板とを備えたことを特徴とする複反射鏡アンテナ装置。 An elliptical main reflecting mirror, a circular secondary mirror provided opposite to the main reflecting mirror, a conical primary radiator provided opposite to the secondary mirror and radiating radio waves to the secondary mirror; , provided at a substantially central portion of the secondary mirror, a trapezoid vertex aligning plate that reflects radio waves radiated to the primary radiator above a reflecting surface from the primary radiator above elliptical shape, the ellipse A double-reflecting mirror antenna apparatus comprising: a vertex matching plate having a minor axis direction of the shape as a major axis direction of the elliptical shape of the main reflecting mirror . 上記頂点整合板は、その周囲をスカート状に形成したことを特徴とする請求項１に記載の複反射鏡アンテナ装置。 2. The double reflector antenna device according to claim 1, wherein the apex matching plate is formed in a skirt shape around the apex matching plate .
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